Question

Point out the wrong statement.

(a) Beginning with version 3.0, MongoDB ships with the WiredTiger storage engine

(b) Some global operations, typically short lived operations involving multiple databases, still require a global “instance-wide” lock

(c) The MMAPv1 storage engine uses collection-level locking

(d) None of the mentioned

This question was addressed to me by my college professor while I was bunking the class.

My enquiry is from Database Profiler topic in section Production Checklist, Security Concepts and Network Security of MongoDB

Answer 1

The correct choice is (d) None of the mentioned

The explanation: MongoDB operations can also yield locks between individual document modifications in write operations that affect multiple documents like update() with the multi parameter.